Yukkin (ユッキン,Yukkin?) is a warm snowman that was created by the design team from the Research Tower. It's a prototype for an all-around temperature regulating plushie- the future ones will be warm in cold weather and cool in warm weather.

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Yukkin doesn't have emotions really, because it's a machine. However, it likes to cuddle and will follow you around. It tries to stay with the people it's assigned to or given to, and keeps them warm in cold climates. Yukkin will also be distressed if you ignore it and don't want to use it.

Yukkin is capable of moving around by bouncing and sometimes by sliding on the surface. It also makes "Yukkin~" noises and able to expresses some emotions. Yukkin actually snuggles, or nuzzles people who hug it (Yogi, Nai), and looks and sounds distressed when people abuse it (Kiharu).

To Yogi's delight, Yukkin is warm and soft to touch and makes a huggable heater.

Yukkin also notices when things are off, like when it noticed the airplane in Episode 10.